ISASP Science 4 ā Questions and Answers
Question 1: A ball is thrown upward. At the highest point of its path, which statement is true?
- Both velocity and acceleration are zero
- Velocity is zero but gravitational acceleration still acts downward (Correct answer)
- Velocity is at its maximum and acceleration is zero
- Both velocity and acceleration are at their maximum
Correct answer: Velocity is zero but gravitational acceleration still acts downward
At the peak, the ball momentarily stops (velocity = 0), but gravity continuously accelerates it downward at 9.8 m/sĀ².
Question 2: Which property of light is demonstrated when a prism separates white light into a rainbow of colors?
- Reflection
- Absorption
- Refraction and dispersion (Correct answer)
- Diffraction
Correct answer: Refraction and dispersion
A prism refracts (bends) light, and since different wavelengths bend at slightly different angles, white light disperses into its component colors.
Question 3: In the rock cycle, which process forms metamorphic rock?
- Cooling of lava at Earth's surface
- Compression and cementation of sediment layers
- Heat and pressure deep within Earth's crust (Correct answer)
- Weathering and erosion of igneous rock
Correct answer: Heat and pressure deep within Earth's crust
Metamorphic rocks form when existing rocks are subjected to intense heat and pressure deep within the crust, changing their mineral structure.
Question 4: A student conducts an experiment to test how fertilizer concentration affects plant growth. Which is the INDEPENDENT variable?
- The height of the plant
- The fertilizer concentration (Correct answer)
- The number of leaves on the plant
- The type of soil used
Correct answer: The fertilizer concentration
The independent variable is what the experimenter deliberately changes ā in this case, the fertilizer concentration.
Question 5: Which statement best describes how the moon affects Earth's ocean tides?
- The moon's heat warms the oceans and causes water to expand
- The moon's gravitational pull causes water to bulge toward and away from the moon (Correct answer)
- The moon reflects sunlight that warms ocean water, causing tides
- Tides are caused by Earth spinning on its axis, not by the moon
Correct answer: The moon's gravitational pull causes water to bulge toward and away from the moon
The moon's gravity pulls on Earth's oceans, creating a tidal bulge on the side facing the moon and another on the opposite side.
Question 6: Which of the following is an example of a physical change?
- Iron rusting when exposed to moisture
- Wood burning in a campfire
- Sugar dissolving in water (Correct answer)
- Milk souring in the refrigerator
Correct answer: Sugar dissolving in water
Dissolving sugar in water is a physical change because the sugar retains its chemical identity and can be recovered by evaporating the water.
Question 7: During which phase of the cell cycle does a cell copy its DNA?
- Mitosis
- Cytokinesis
- G1 (Gap 1)
- S phase (Synthesis phase) (Correct answer)
Correct answer: S phase (Synthesis phase)
DNA replication occurs during the S (synthesis) phase of interphase, before the cell enters mitosis.
ISASP Science 4
A ball is thrown upward.
At the highest point of its path, which statement is true?